SCI REP:核受体COUP-TFII的失调会损害骨骼肌发育

2017-06-10 MedSci MedSci原创

现有研究已经证实,鸡卵白蛋白上游启动子转录因子II(COUP-TFII)可以在体外抑制肌细胞生成和骨骼肌代谢。然而,其在肌肉发育中的确切作用和体内功能尚未明确定义。COUP-TFII蛋白表达水平在未分化祖细胞中较高,分化期间逐渐下降,因此我们提出了一个重要问题,即适当的肌细胞分化是否需要COUP-TFII表达的下调。

现有研究已经证实,鸡卵白蛋白上游启动子转录因子II(COUP-TFII)可以在体外抑制肌细胞生成和骨骼肌代谢。然而,其在肌肉发育中的确切作用和体内功能尚未明确定义。COUP-TFII蛋白表达水平在未分化祖细胞中较高,分化期间逐渐下降,因此我们提出了一个重要问题,即适当的肌细胞分化是否需要COUP-TFII表达的下调。在本研究中,我们构建了在肌原体前体细胞中外源性表达COUP-TFII的小鼠模型,以在肌肉发生过程中维持COUP-TFII活性,发现升高的COUP-TFII活性会导致骨骼肌发育异常。利用体外的细胞培养和体内小鼠模型实验,我们发现COUP-TFII通过抑制成肌细胞融合来阻碍骨骼肌发育。在机制上,肌肉细胞融合异常与对于细胞融合重要的基因Npnt,Itgb1D和Cav3的转录抑制具有良好的相关性。我们进一步表明,COUP-TFII还降低了粘着斑激酶(FAK)的激活,而FAK是融合过程所必需的整合素下游的调节因子。总而言之,我们的研究突出了下调COUP-TFII信号传导,对于诱导成肌细胞融合的必需的因子的调节,至关重要。

原文出处:

Hui-Ju Lee,Chung-Yang Kao,Ming-Jer Tsai,et al.Dysregulation of nuclear receptor COUP-TFII impairs skeletal muscle development.[J]2017 June 9.doi:10.1038/s41598-017-03475-5

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